/**
 * @name lang.JSON
 * @namespace
 */
san.def("lang.JSON",function(san){
	
    /**
	 * ECMA-262-5 15.12
	 * www.json.org/json2.js
	 */
	//EXPOSE
    return JSON ||
    (JSON = (function(){

        //Date.prototype.toJSON have been defined in Date prototype extentions
        String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON =
        function(key){
            return this.valueOf();
        }

        var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        gap,
        indent,
        meta = {
            // table of character substitutions
            '\b': '\\b',
            // ASCII 8, Backspace
            '\t': '\\t',
            // ASCII 9, Tab
            '\n': '\\n',
            // ASCII 10, Newline
            '\f': '\\f',
            // ASCII 12, Formfeed
            '\r': '\\r',
            // ASCII 13, Carriage Return
            '\"': '\\"',
            '\\': '\\\\'
        },
        rep;

        /**
         *  If the string contains no control characters, no quote characters, and no
         *  backslash characters, then we can safely slap some quotes around it.
         *  Otherwise we must also replace the offending characters with safe escape
         *  sequences.
         * @private 
         * @param {Object} string
         */
        function quote(string){

            escapable.lastIndex = 0;
            return escapable.test(string) ? '"' +
            string.replace(escapable,
            function(a){
                var c = meta[a];
                return typeof c === 'string' ? c: '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice( - 4);
            }) +
            '"': '"' + string + '"';
        }


        function str(key, holder){

            // Produce a string from holder[key].

            var i,
            // The loop counter.
            k,
            // The member key.
            v,
            // The member value.
            length,
            mind = gap,
            partial,
            value = holder[key];

            // If the value has a toJSON method, call it to obtain a replacement value.

            if (value && typeof value === 'object' &&
            typeof value.toJSON === 'function'){
                value = value.toJSON(key);
            }

            // If we were called with a replacer function, then call the replacer to
            // obtain a replacement value.

            if (typeof rep === 'function'){
                value = rep.call(holder, key, value);
            }

            // What happens next depends on the value's type.

            switch (typeof value){
            case 'string':
                return quote(value);

            case 'number':

                // JSON numbers must be finite. Encode non-finite numbers as null.

                return isFinite(value) ? String(value) : 'null';

            case 'boolean':
            case 'null':

                // If the value is a boolean or null, convert it to a string. Note:
                // typeof null does not produce 'null'. The case is included here in
                // the remote chance that this gets fixed someday.

                return String(value);

                // If the type is 'object', we might be dealing with an object or an array or
                // null.

            case 'object':

                // Due to a specification blunder in ECMAScript, typeof null is 'object',
                // so watch out for that case.

                if (!value){
                    return 'null';
                }

                // Make an array to hold the partial results of stringifying this object value.

                gap += indent;
                partial = [];

                // Is the value an array?

                if (Object.prototype.toString.apply(value) === '[object Array]'){

                    // The value is an array. Stringify every element. Use null as a placeholder
                    // for non-JSON values.

                    length = value.length;
                    for (i = 0; i < length; i += 1){
                        partial[i] = str(i, value) || 'null';
                    }

                    // Join all of the elements together, separated with commas, and wrap them in
                    // brackets.

                    v = partial.length === 0 ? '[]': gap ? '[\n' + gap +
                    partial.join(',\n' + gap) +
                    '\n' +
                    mind +
                    ']': '[' + partial.join(',') + ']';
                    gap = mind;
                    return v;
                }

                // If the replacer is an array, use it to select the members to be stringified.

                if (rep && typeof rep === 'object'){
                    length = rep.length;
                    for (i = 0; i < length; i += 1){
                        k = rep[i];
                        if (typeof k === 'string'){
                            v = str(k, value);
                            if (v){
                                partial.push(quote(k) + (gap ? ': ': ':') + v);
                            }
                        }
                    }
                }
                else{

                    // Otherwise, iterate through all of the keys in the object.

                    for (k in value){
                        if (Object.hasOwnProperty.call(value, k)){
                            v = str(k, value);
                            if (v){
                                partial.push(quote(k) + (gap ? ': ': ':') + v);
                            }
                        }
                    }
                }

                // Join all of the member texts together, separated with commas,
                // and wrap them in braces.

                v = partial.length === 0 ? '{}': gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
                mind +
                '}': '{' + partial.join(',') + '}';
                gap = mind;
                return v;
            }
        }

        /**
         * ECMA-262-5 15.12.2
         * The parse method takes a text and an optional reviver function,
         * and returns a JavaScript value if the text is a valid JSON text.
         * @lends lang.JSON
         * @param {Object} text
         * @param {Object} reviver {optional}
         * @return {String}
         */
        var parse = function(text, reviver){


            var j;

            // The walk method is used to recursively walk the resulting structure so
            // that modifications can be made.
            function walk(holder, key){

                var k,
                v,
                value = holder[key];
                if (value && typeof value === "object"){
                    for (k in value){
                        if (Object.hasOwnProperty.call(value, k)){
                            v = walk(value, k);
                            if (v !== undefined){
                                value[k] = v;
                            }
                            else{
                                delete value[k];
                            }
                        }
                    }
                }
                return reviver.call(holder, key, value);
            }


            // Parsing happens in four stages. In the first stage, we replace certain
            // Unicode characters with escape sequences. JavaScript handles many characters
            // incorrectly, either silently deleting them, or treating them as line endings.

            text = String(text);
            cx.lastIndex = 0;
            if (cx.test(text)){
                text = text.replace(cx,
                function(a){
                    return '\\u' +
                    ('0000' + a.charCodeAt(0).toString(16)).slice( - 4);
                });
            }

            // In the second stage, we run the text against regular expressions that look
            // for non-JSON patterns. We are especially concerned with '()' and 'new'
            // because they can cause invocation, and '=' because it can cause mutation.
            // But just to be safe, we want to reject all unexpected forms.

            // We split the second stage into 4 regexp operations in order to work around
            // crippling inefficiencies in IE's and Safari's regexp engines. First we
            // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
            // replace all simple value tokens with ']' characters. Third, we delete all
            // open brackets that follow a colon or comma or that begin the text. Finally,
            // we look to see that the remaining characters are only whitespace or ']' or
            // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

            if (/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').replace(/(?:^|:|,)(?:\s*\[)+/g, ''))){

                // In the third stage we use the eval function to compile the text into a
                // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
                // in JavaScript: it can begin a block or an object literal. We wrap the text
                // in parens to eliminate the ambiguity.

                j = eval('(' + text + ')');

                // In the optional fourth stage, we recursively walk the new structure, passing
                // each name/value pair to a reviver function for possible transformation.

                return typeof reviver === 'function' ? walk({
                    '': j
                },
                '') : j;
            }

            // If the text is not JSON parseable, then a SyntaxError is thrown.

            throw new SyntaxError("Invalid JSON: " + text);
        };



        /**  
         * ECMA-262-5 15.12.3
         * This method produces a JSON text from a JavaScript value.
         * The stringify method takes a value and an optional replacer, and an optional
         * space parameter, and returns a JSON text. The replacer can be a function
         * that can replace values, or an array of strings that will select the keys.
         * A default replacer method can be provided. Use of the space parameter can
         * produce text that is more easily readable.
         * @lends lang.JSON
         * @param {Object} value
         * 					any JavaScript value, usually an object or array.
         * @param {Object} replacer {optional}
         * 					an optional parameter that determines how object
         * 					values are stringified for objects. It can be a
         * 					function or an array of strings.
         * @param {Object} space  {optional}
         * 					an optional parameter that specifies the indentation
         * 					of nested structures. If it is omitted, the text will
         * 					be packed without extra whitespace. If it is a number,
         * 					it will specify the number of spaces to indent at each
         * 					level. If it is a string (such as '\t' or '&nbsp;'),
         * 					it contains the characters used to indent at each level.
         */
        var stringify = function(value, replacer, space){

            var i;
            gap = '';
            indent = '';

            // If the space parameter is a number, make an indent string containing that
            // many spaces.

            if (typeof space === 'number'){
                for (i = 0; i < space; i += 1){
                    indent += ' ';
                }

                // If the space parameter is a string, it will be used as the indent string.

            }
            else
            if (typeof space === 'string'){
                indent = space;
            }

            // If there is a replacer, it must be a function or an array.
            // Otherwise, throw an error.

            rep = replacer;
            if (replacer && typeof replacer !== 'function' &&
            (typeof replacer !== 'object' || typeof replacer.length !== 'number')){
                throw new SyntaxError('JSON.stringify');
            }

            // Make a fake root object containing our value under the key of ''.
            // Return the result of stringifying the value.

            return str('', {
                '': value
            });
        };


        return{
            parse: parse,
            stringify: stringify
        };

    })());
		

});